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Taxation - Summary of tax relating to components of other comprehensive income or loss (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract]
– Cash flow hedge fair value gains	$ 62,000,000	$ 3,000,000	$ (6,000,000)
Tax (charge)/credit on re-measurement gains/(losses) on pension and post-retirement healthcare plans	(305,000,000)	112,000,000	83,000,000
Tax relating to components of other comprehensive income/(loss) for the year	(243,000,000)	115,000,000	77,000,000
Deferred tax credit (charge) included in other comprehensive income	243,000,000	(115,000,000)	(77,000,000)
Current tax charge included in other comprehensive income	$ 0	$ 0	$ 0

X

- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

+ References

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]]

+ References

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- Definition

Current tax expense (income) relating to components of other comprehensive income.

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- Definition

Deferred tax expense (income) relating to components of other comprehensive income.

+ References

No definition available.

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